Nevin Manimala Statistics

Understanding Causes for Admission in Planned Ambulatory Percutaneous Nephrolithotomy

J Endourol. 2022 Jun 14. doi: 10.1089/end.2021.0811. Online ahead of print.


INTRODUCTION: For treatment of nephrolithiasis, ambulatory percutaneous nephrolithotomy (aPCNL) is growing in popularity for select patients. The aim of this study was to investigate the safety and efficacy of a set of aPCNL selection criteria as well as search for predictors of failed aPCNL resulting in inpatient admission.

METHODS AND MATERIALS: We reviewed all PCNL patients from 2016-2020. A total of 175 met selection criteria for aPCNL and were included. Primary outcome was safety and efficacy, and secondary outcome was to identify predictors of inpatient stay. Demographic and peri-operative data were analyzed with both descriptive and inferential statistics.

RESULTS: In total, between 2016-2020, 552 patients underwent PCNL, with 175 of them meeting criteria for aPCNL. 134/175 (76.6%) of these patients were successfully discharged the same day as the surgery and 41 patients were admitted. On univariate analysis, patients who required upper pole access or multiple accesses, (p=0.038) ASA>2 (p=0.005), or postoperative nephrostomy tube (PCN) (p<0.001) were more likely to be admitted after surgery. On multivariate analysis, only postoperative PCN was significantly associated with admission (p=0.015). Regarding reasons for unsuccessful aPCNL, 19.5% of admissions were attributed to intraoperative complications, 7% to social causes, 12.2% to postoperative complications, 14.6% to uncontrolled pain, and 34.1% to unexpected intraoperative procedures.

CONCLUSIONS: Ambulatory PCNL using selection criteria is safe and effective, with postoperative PCN predicting the possible necessity for conversion to inpatient admission. Furthermore, our study provides a practical algorithm for those opting to provide ambulatory PCNL to patients.

PMID:35699065 | DOI:10.1089/end.2021.0811

By Nevin Manimala

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